No person shall obstruct or molest any person authorised or empowered obstruction or

by or under this Act, or with whom the Municipality or any of the municipal molestation in authorities referred to in section 20 has lawfully contracted, in the execution of execution of work. his duty or anything which he is authorised or empowered or required to do by virtue or in consequence of any of the provisions of this Act or the rules or the regulations made thereunder, or in fulfilment of his contract as the case may be. C. Public Notice and Advertisement Public notices how to